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Free-to-air TV: Friday, April 19

What's most interesting about this cheeky, lo-fi US factual series is not so much what happens when long-married couples commit to having sex seven days in a row, but the steps they have to take to do so. There's no question physical intimacy is a crucial glue in holding relationships together. But a couple's sex life is also the canary in the coalmine and both pairs tonight - likeable folk who seem to really care for each other - are forced to confront why they've stopped having sex before they can start doing it again. Like a poor man's Making Couples Happy, it's really interesting to get a clear-eyed look at the often petty things that get a marriage unravelling. And the show's good nature and sense of fun make the lessons entertaining, too.

Silent Witness, ABC1, 8.30pm

It will astonish no one who watched the first instalment of this two-parter to discover that Dr Jack is invited to join the Lyell Centre team. What is a surprise is the helper he brings with him, a character who promises to add a great deal to the mix. Indeed, this concluding ep is packed with classic Silent Witness surprises and intrigues, in the boardroom battles as much as the morgue. We also welcome the addition of homicide detective Seetha Gold (a wonderfully tough Priyanga Burford). I hope we'll be seeing a great deal more of her. Sharon Small is also good. Best of all, a staggering 16 seasons and 17 years down the track, Witness remains as creepy, claustrophobic, clever and tightly plotted as ever.

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Escape to the Country, 7Two, 8.30pm

This fantastically popular lifestyle series (the 14th season starts tonight) is a funny mix. On the one hand, plenty of us dream of a rural escape to the lush fields of Britain, within an easy pony ride of a quaint village and a cosy pub. And the houses we tour are, as a rule, biscuit-tin perfect from the outside. On the other, never have I seen such an appalling collection of interior decor. In too many charming cottages, low ceilings and dim windows combine with chintz overload and garish paint jobs to create homes any sensible person would want to run from rather than run away to. But the prospective buyers don't seem at all bothered. I don't think it's much of a spoiler to say tonight our pleasant middle-aged couple do indeed find the escape of their dreams.